Portion of a paint brush



FIG. 1 is a perspective view of a portion of a paint brush according to the present invention;

FIG. 2 is a reduced side elevational view thereof;

FIG. 3 is a reduced rear elevational view thereof;

FIG. 4 is a reduced front elevational view thereof;

FIG. 5 is a reduced top plan view thereof; and,

FIG. 6 is a reduced bottom plan view thereof.

The structure shown in broken lines forms no part of the claimed design. 

The ornamental design for a portion of a paint brush, as shown and described. 